Charles f



@einen mes l @sont @man4 MASSACHUSETTS'. Letter@ Panam. 71,339, dated November 26, 1867.

IMPROVBD lamiamo-root.

itin Straal referat tu in 'tigen zttm, tant ma mating nuttfnfltlgr amt.

TO ALL PERSONS TO WHOM THESE PRESENTS MAY COME:

. Be it known thatv we, CHARLES F. SYLVESTER and JOHN BROOKS, of North Bridgewater, in the county otr Plymouth, land State of Massachusetts, have invented an Improved Reaming-Tool or Mechanism;,and we do` 4,hereby declare thevsame to be fully described inthe following speciiication, and represented in the accompanying drawings, ot' which l f i Figurel is a side view,

Figure 2 a longitudinal section, and

Figure 3 a transverse section of it.

In such drawings, A denotes a cylinder or cutter-carrier, formed with a series of radial grooves, g, to receive a series of rea'tningcutters,l a a a,"&c., which al-e disposed within the carrier at equal distances apart, the grooves running lengthwise of the cylindei` or carrier. Projecting from one end of the grooved'cylinder` or carrier A is a male `screw, 6, on which is screwed d) cone, B, with its smaller end next to the end ofthe cylindeilA. -A clamp- ,l

nutfC, is also4 Screwed upon the screvvlb, such nut being formed with a chamber, o, to receive the conc B. This chamber has a conical'mouth, d, to receive and t upon the bevelled 4ends'o' thefseriesof cutters, cach of such cutters bein formed an ular Or wedGe-sha ed at .each of its ends, in `'manner as shown in tiff. 2. The several g g e P e cutters rest on the cone B, and also on a stationary cne, E, extending from the opposite endot' the cylinder 01 `cutter-carrier A, the smaller base of thc cone E beingjoined to the said cylinder. Fromthe larger basefof the eone,.a shank or shaft, F, projects, and h as a'lnale screw, e, cut 'upon it next to the largerbase of the cone E. The several cutters rest upon the cone E, and are held therein byllneans of, a clamp, G, which is screwed upon the screw'e, and formed with a conical recess,f,to receive and embx'ace'the ends of he cutters, in manner as shown in iig. 2. l i

By screwing'the cone B toward the cutters, and in a'like degree unscrewing the nut G, the several cutters will he` moved upon the two cones B andu E, in a manner tocause each of such cutters to be pressed laterally away from the axis of the cylinder A. Inthis way the serie's of cutters may be` expanded, as the operation above mentioned will force them to simultaneously ascend both the cones. After any such expansion of the series, the cutters may be clamped in their positions by means of the two nuts yC and G. The cutters may be `expanded. at one end of the, series more than at the other, in order to adapt their; for roaming a tapering hole. i

From the above, it will be seen that `the series of cutters may bc readily adjusted, as occasion may require,

for dlfectng by them the roaming of either a cylindrical ora tapering hole'in a piece of metal or othermhateriah In Order to usc the roaming-tool, its cutters areto be placed within the hole to be roamed, 'and the shank of' the tool is to bc revolved so as to cause the several cutters to enlarge the hole.

We claim the expansive reamer, as composed of the slotted tool-carrier A, the series ot'l cutters a, the

Vstationary conc E, the adjustable' cone B, the screws`l b and e, and the clamp-nutsC and G, and the shank F, arranged, combined, and constructed in manner and so as to operate substantially as explained and represented.

CEAS. ,-SYLVESTER, Y

A JOHN BROOKS,

Witnesses: n

CHANDLER SPRAoUn, WM.'H. AUSTIN. 

